Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a85dc677593ed64…

MALICIOUS

PDF

52.4 KB Created: 2020-08-31 14:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: aad75e7903422b0b94d13bb403012bc3 SHA-1: 4c74519f923c7b82be6c3ce6451d333dd37f768c SHA-256: 0a85dc677593ed643f10924d73ab1de0f6eb76bb45c5db6119aadfab1b4b4a68
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wix?keyword=pathology+book+for+bhms+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://static.usrfiles.com/ugd/accd1f_c1084647aa4f431c87042403eceb8a12.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3e9e83_6da19d13b29d460db25c6748997d16e1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_e39f5220c022485ba0e63cdb5461b43d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/12745a_aa21730155e34f958936ef88037f9b69.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b914b5_c2ec854c87c64baea9ddd90839d2fdab.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/87a178_2757217aa41c40839586af23f18eada6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_eb8056e2478d4a9590e3d1a63ee3de1e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_d5015d7093324947bdb15965c442a8df.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6435/1130/files/16782004490.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4227/4454/files/12189238274.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9462/1862/files/boomoji_3d_avatar_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/6103/9524/files/anti_money_laundering_act_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3269/1367/files/arabic_language_course_in_urdu_free_download.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/97634b_67c003ffa489428588f3823ed421116a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b6bf5b_9686377082174dd7898b77138a2563fa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6167 5760 bytes
SHA-256: 87b79431c46a12a193716b5aa04a5a835c99d4dd7b0da5a5b9db877c713b4b2d
font_01_sfnt_off000074e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74E2 2524 bytes
SHA-256: f2ed492112c308a0b42984f36ecb5fe7a88bc5eb11be8bb340a3bc330b549b71
font_02_sfnt_off00008024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8024 2320 bytes
SHA-256: d97e055e11de589539a249dfdf9c15aca1e9caf4700104d1763a3a5d87d8f7f2
font_03_sfnt_off00008a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A75 9852 bytes
SHA-256: 85d474d1102afe7d8bb7041937c26f98519626727ddda6cca8d4d1919e2562e3
font_04_sfnt_off0000ac81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC81 16224 bytes
SHA-256: 207faf14306426b668b87aba0c9d447b8ba40b67f0f7b18660ffa0d3c8132265

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